I've been doing some testing of my new wan connection and noticed that
when I specify a window with ip route it still changes after a while.
Using 2.6.16.11 and latest iproute2.
ip ro del default
ip ro add default via 192.168.0.1 window 28000
ip ro ls
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.3
default via 192.168.0.1 dev eth0 window 28000
timestamps and window scaling are off using reno.
Downloading a 5 meg file I advertise the correct window - the whole
multiple of my mss below 28000 = 27322.
After about 1300 lines of the dump the window creeps back up to 32767.
001959 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1051979:1053417(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1053417 win 27322
002030 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1053417:1054855(1438)
ack 123 win 57520
001962 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1054855:1056293(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1056293 win 27322
003020 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1056293:1057731(1438)
ack 123 win 57520
001968 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1057731:1059169(1438)
ack 123 win 57520
000012 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1059169 win 30198
002024 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1059169:1060607(1438)
ack 123 win 57520
000012 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1060607 win 32767
001980 IP 81.31.115.186.80 > 192.168.0.3.42305: . 1060607:1062045(1438)
ack 123 win 57520
000011 IP 192.168.0.3.42305 > 81.31.115.186.80: . ack 1062045 win 32767
Andy.
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